Lock



T. H. JOSEPH I Aug. 6, 1935.

LOCK

7 Filed March 10, 1934 2 Sheets-Sheet l INVENTOR ATTQRNEY T. H. JOSEPH Aug. 6, 1935.

LOCK

Filed March 10, 1934 2 Sheets-Sheet 2 INVENTOR Mada/r /7. 75.5?) Q. 51 W ATToRNEY Patented Aug. 6, 1935 UNITED STATES PATENT OFFICE LOCK Theodore H. Joseph, New York, N. Y.

Application March 10',

9 Claims.

This invention relates to looks, and more particularly to a door lock having an auxiliary or secondary latch which must be in operative engagement before the main lock bolt can be thrown to locking position.

Many stores and business places employ double leaf swinging doors at the entrances and for added protection and insurance requirements, a secondary locking means is necessary. The general procedure has been to employ a system of vertical rods or bolts which are adapted to project from the top and bottom of one of the doors, called the standing leaf and which engage sockets placed in the door sill and the upper cross member of the frame. To this standing leaf door section is then secured the other, or swinging, leaf section by means of a single bolt door look. It often occurs that the vertical door bolts are overlooked and are not thrown, and consequently the standing leaf is not secured from swinging. When the main lock is thrown, the bolt extends across adjoining edges of the doors, but since both are in swinging position. a relatively small force applied at the intersection is sufficient to force them back and pull the bolt from its cooperating socket. It is the purpose of this invention to provide a door lock which has two separate fastening members neither of which can be employed without the joint operation of the other. The invention can be used on any type of door and is not limited to double leaf doors.

One of the chief objects this invention is to provide a lock having an auxiliary latch associated therewith.

Another object is to provide an interlock feature whereby both locking members are interdependent.

A further object is to provide a lock with two distinct locking elements neither of which is effective singly.

Still a further object is to provide a lock in which the elements are shielded and offer no purchase for outside leverage whereby the lock might be rendered inoperative.

Other objects and advantages will in part be explained and in part be obvious in the following specification and claims in which:

Fig. l is a fragmentary view in front elevation of a double leaf door secured by the improved lock; Fig. 2 is a horizontal section taken on the line 2--2 of Fig. 1; Fig. 3 is a rear elevation broken away to show the main bolt in locked position; and Fig. 4 is a rear elevation broken away to show the interlock feature rendering both elements ineffective until the auxiliary latch is first thrown.

1934, Serial No. 714,932

(Cl. IO-14) Referring in more detail to the drawings, in Fig. 1 there is indicated by the numerals l and 2, the two sections of a double leaf swinging door. Mounted upon section I is an escutcheon plate 3, with a door knob 4 and a cylinder lock 5. Upon door section 2 is shown the latch escutcheon and the auxiliary latch 1, which cooperate with a latch keeper 8 mounted upon the door section I. The keeper 8 is formed with a downwardly extending apron 8a which screens the latch hook and prevents the insertion of a jimmy or other forcing device.

In Fig. 2 there is shown a suitable tumbler mechanism and the main lock bolt 9, and the bolt housing 10. The auxiliary latch 1 is attached to a square or keyed shaft II which cooperates with an extensible sleeve coupling 12 formed upon the interlock device l3 shown in detail in Fig. 3. If desired, a knob may be provided to operate the latch and interlock from the inside of the door. The main bolt keeper l4 houses the interlock'device and receives the bolt 9.

Fig. 3 shows the bolt 9 in locked position with the interlock I3 in withdrawn position to receive the bolt, and maintain the latch 1 in the horizontal or locking position. There may be formed upon the interlock a dog l5, which cooperates with a notch in bolt 9. When the elements are positioned as shown, the auxiliary latch 1 extends across the door opening on the opposite side in locked relation with the latch keeper 8, as shown in Fig. l.

The function of interlock I3 is displayed in Fig. 4, where it can be seen that when latch 1 is hanging in inoperative position, the curved segment of interlock 13 is swung downwardly across the lock bolt entrance in bolt keeper l4 and blocks the engagement of lock bolt 9. It is thus made impossible for the main lock to be operated until the latch 1 is swung upwardly into position, and conversely, latch '1 cannot subsequently be disengaged until lock 5 is opened.

The two door sections are thus secured at both sides, one side having a bolt extending across the opening, and the other being tied together with the latch member. The door sections being tied together, eliminates the usual method of breaking and entering, which consists of inserting a claw bar into the aperture between the opposing door parts, and prying one section away from the other until the of the keeper and the door swings open.

It will be apparent that many changes and modifications may be made in the invention here disclosed by any person skilled in the art without departing from the scope and true spirit of ordinary bolt slips out the invention claims:

What I claim is:

1. A look mechanism having a plurality of closure fastening elements associated therewith, and

which is defined in the following prevent the throwing of said main bolt until said latch bolt reaches a latched position.

4. In a lock mechanism, a slidable bolt, an auxiliary closure fastening from movement when said latch bolt is in unlatched position.

6. In a lock mechanism, a slidable bolt, a bolt keeper cooperating with said slidable bolt, a latch bolt carried by said bolt keeper, and means coneffective engagement.

9. In a lock mechanism having a main bolt and an auxiliary latch bolt, means operated by main bolt in locked position to maintain said latch bolt in latched position.

THEODORE H. JOSEPH. 

